Ignition-timing mechanism



W. E. SCHWARZIVIANN. IGNITION TIIVIING FIIECHANISM. APPLICATION man SEPT. 2a, 1911.

l,375,263. Patented Apr. 19', 1921.

the adjustable member to UNITED STATES: 'PATENT lorifice MESNE ASSIGNMENTS, To eiaERIoAn-j nosotr MAGNETO CORPORATION, OFjNW YORK, n. Y., acORRORATION or NRW YORK! Y' IGNITION -TIMIN G MECHAN ISM.

' .Applicationiled September 26, 1917.;

To all whom it 'may @ancora e vit known that I, WOLFGANG E SCHWARZMANN, a* citizen of the Unite( States, residing at 5l Long Meadow, Springfield, in the county of Hampden, State of Massachusetts, have invented certain new and useful Improvements in Ignition-Timing Mlechanism; and I do hereby declare the following-' to be a full, clear, and exact description olf the invention, such as will enable others skilled in' the art to which it use the same.

`An ignition system appeitains to make and almost invariably provides variable timing periods to suit the vdifferent speed and load conditions imposed on the engine with which it is associated. To do this, the mechanical interrupter of the magneto or the sparking coil has an adjustable member to which is attached a timing member 'connected by an rod to the control lever on the steering wheel of a moving vehicle or a convenientfpart of a stationary organization. It' has been customary heretofore to fasten a timing` arm to the adjustable member of the interrupter by a screw or other device rigidly connecting them together, but in that arrangement the adjusting pull on the control lever is applied the adjustable member and sometimes causes bind in its bearmg, particularly if a decided increase in the resistance develops in the bearing.

It is often necessary for the timing member to be located on one side or tht` other of the adjustable member of the interrupter or above or below it, or at some intermediate point, in order that the adjusting wire or rod from the control lever may be'attached to it most conveniently. Ordinarily the adjustable member of the interruptor carries cams which are periodically engaged by the deflectable one of the pair of. rotatable interrupter elements. Since these cams must be accurately positioned relatively to each other, they are fastened in the adjustable member by the manufacturer of the mechanical interruptcr, and therefore thc engine builder is often inconvenienced in installing the magneto or the adjusting wire or rod, To meet this contingency, the adjustable member of the interrupter has been provided with several longitudinal slots into a specification of Letters Patent.

adjusting Wire Or ringifor connection to at a Single point of the periphery of' Patented Apr. 19, 1921. Serial No. 193,242.

selected one Which is set a lug Or feather carriediby thr timing ring, and. to the timing ring is attached a timing arm connected to the adjusting Wire or rod. While this arrangement provides several positions of connection, vit requires a thicker adjustable member to provide for the Slots, .and it results; as before, in a single point of application of the adjusting pull to the adjustable member. Furthermore, the timing ring is not positively prevented from working off from the adjustable member in an axial direction as a result of the continual vibration to which it is subjected by the engine.

n accordance with my invention, the timing member comprises a ring` having Wedge teeth meshed with wedged-teeth on the adjustable member as to positively interlock or engage therewith 'at a plurality of points around their periphery, and an arm fast with the timing the adjustable Wire or rod from the control lever. This arrangement distributes the adjusting pull of the ycontrol lever around the periphery of the adjustable member, and so also the timing ring may be connected to the adjustable member in substantially any angular relation desired. These results are nicely attained in the preferred embodiment hereinafter described as an example of my invention, by nurling a ring on the outer Surface of the adjustable member of the interruptor and broaching the inner surface of the timing ring, the timing ring and a portion of the timing arm being split so as to be capable of contraction and expansion diametrically in connecting 'and disconnccting the parts. By nurling the ring .intermediate of the end faces of the-adjustable member` the side ledges of the knurled portion positively, prevent the contracted timing ring fromivorking off the adjustable member in an axial direction.

Inv the accompanying drawings, illustrating this preferred embodiment of my invenj tion inapplica'tion, as an example, to a magneto,

naled in a bearing in the magneto housing 8 for adjusting movements through an angle determined by the slot 9 and a pin projecting thereinto from the magneto housing, and it is held in its bearing by a pivoted s ring finger 10 pressing the cover 11 over tile outer end face of the cam member. The interrupter element 3 is deflected periodically, upon engagement of the liber block 12 With the cams 5, to separate it from the cooperative .element 2 and thereby interrupt the circuit 'of the magneto winding during its period oit maximum voltage generation. These features are Well known in the art.

The cam member has a knul-led ring 13 intermediate its veiid faces. The' timing ring 14 has its inner surface breached at 15, and has integral With it a timing arm 16 with a perforated boss'l? to which is connected the adjusting rod or Wire 13 extending to the control `lever on the steering wheel of a moving vehicle or to a convenient member of a stationaify' organization. The timing ring and a part of the timing arm areisplit at 19 and the clamping screnY 20 passing through the split portion is adapted to contract or expand the timing ring. rllhe knurled ring 13 and the broached surface 15 have meshed Wedge teeth positively interlocking or engaging at a plurality of points around their periphery to hold the cam member and the timing ring in substantially any angular relation desired, whenever the ring is Vclamped onto the cam member by the clamping screw 20.

The timing ring 14 is somei'vhat narrotlver than the Vknu rled ring 13 so that When the f knurled and broached surfaces are mshed, the side ledges 21 of the knurled ring act asabutments to the side faces 22 of the breached 'surface Iand thereby prevent tlie ring from Working o from the .cam member in an axial direction as a re.

sult of vibration. l

To connect the timing ring in any desired relation with the cam member, the ring is expandedby the screw 20 until its inner diameter exceeds the outer diameter of the .cam member. The' timing ring is then slipped over the cam member` until the Wedge teeth ot its breached surface are in nnsito'nto mesh With the Wedge teeth of the remesa 1. ln variable timing mechanism for me-` chanical interrupters for ignition apparatus, anadjustable member carrying one of the elements of the mechanical interrupter and having Wedge teeth on its periphery, a timing member comprising an' arm and a ring connected to the arm and havingA Wedge teeth adapted to mesh with the Wedge teeth on the adjustable member, and means for contracting and yexpanding the ring around the adjustable member, whereby the ring and the adjustable member may be meshed around their peripheries with the arm eX- tending` in any desired angular relation to the adjustable member for connection to an adjusting `vvi're or rod.

2. lin variable timing mechanism for mechanical interrupters for ignition apparatus, a cam ring having wedge teeth entirely around its outer periphery, a timing member comprising an arm and a ring connected to the arm and having Wedge teeth entirely around itsinner periphery adapted to mesh with the cam ring, and meL ns for contracting and expanding the ring around the cam ring, whereby the cam and timing rings may be meshed around their peripheries with the arm extending in any desired angular relation to the cam ring'for connechaving Wedge teeth on its periphery, a timi ing member comprising a ring and an arm connected to the ring and being breached to mesh with the adjustable member, and means for contracting and eXpandin the ring aijound the adjustable member, W ereby the ring and the adjustable member may be meshed around their peripheries with the arm extending in any desired angular relation to the adjustable member 1tor connection to an adjusting Wire or rod.

4. In variable timing'mechanism for mechanical interrupters for ignition apparatus, an adjustable member carrying `one of the elements of the mechanical interrupter and having Wedge teeth on its periphery, a timing member comprising an arm and a split ring connected to the arm and having may be removed from thev .the elements of the mechanical interrupter and having wedge teeth on its outer periphery intermediate the end faces thereof and extending below the'outer surface to form side ledges, a timing member comprisingan arm and a ring connected to the arm and having wedge teeth on its inner surface, and

means for contracting and expanding the ring around the adjustablememberlbetween the side ledges, whereby the ring and the adjustable member may be meshed Varound their peripheries and held sidewise with the arm extending in any desired angular relation to the adjustable member for connection to an adjusting wire or rod.

In testimony whereof I affix my signature.

. Y WOLFGANG E. SCHWARZMANN. 

